What pressure range is considered acceptable for APU accumulators?

The accepted pressure range for APU (Auxiliary Power Unit) accumulators is critical for ensuring the proper function and reliability of the APU system. The pressure range of 2700-3100 psi is designed to provide sufficient hydraulic pressure required to operate the APU effectively, ensuring it can perform its functions without compromise.

APU accumulators store hydraulic fluid under pressure, supplying the necessary power to start the APU and assist in various aircraft systems. If the pressure is too low, the APU may not start or operate efficiently, and if it's too high, it could potentially lead to system failures or safety hazards. The chosen range supports optimal operation within the limits established by the aircraft manufacturer, balancing performance and safety requirements.

The other provided options do not align with the specifications for APU accumulator pressures. For example, pressures below 2700 psi may not provide the necessary performance, while pressures above 3100 psi could exceed safe operating limits. Understanding these specifications helps maintain the safety and reliability of aircraft operations.